... 2.Light yellow,Transparent PU 3.Waterproofing JBY-669 Polyurethane Glue Foam For Polysterol Foaming AgentProduct IntroductionIt is used ... colloid, avoiding to collapse. SL-669 is single-liquid polyurethane hydrophilicity foaming and can rapid swell when going through water ... resistance, strong structure & high toughness.Physical property JBY-669 Polyurethane Glue Foam For Polysterol Foaming Agent